Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
The parameters Rising, Falling and Needle Lift use the values preset in the menu. When the
trigger signal is set to “logic 1”, the valve will open. It will remain open as long as the trigger
signal remains on “logic 1”. It will start to close when the trigger signal is switched to “logic 0”.
After the valve has completely closed, the controller is ready to receive the next trigger signal
to start the process again.
INFORMATION
Open Time and Needle Lift
The maximum value for the “Open Time” is limited to 15 ms, if the “Needle Lift” is set to more
than 80 %. If not, the limit is 3000 ms. The length of the “Open Time” depends on the PLC-signal
(logic 1).
7.3 Parameters for the Dispensing Process
The profile of the system behavior is illustrated below (Y axis = amplitude of the tappet).
Fig. 48: System behavior
This diagram includes the following parameters.
Parameter Description
Rising (RI)
This interval describes the time required until the valve is completely
opened. It is adjustable in steps of 0.01 ms.
Open Time (OT)
During this phase, the valve remains in opened state. It is adjustable in steps
of 0.1 ms.
Max. open time for ≤ 80 % NL = 3000 ms
Max. open time for > 80 % NL = 15 ms
CAUTION!
When working in External mode, the cycle is initiated with following
properties:
For rising, falling, delay and needle lift, the values determined beforehand
are used. Open time however remains active until the signal returns to the
state “logic 0” (for needle lift ≤ 80 %).
Maximum open time for needle lift > 80 % is restricted to 15 ms.
Falling (FA)
The falling ramp of the curve illustrated above represents the time required
for closing the valve. Residual fluid meanwhile is expulsed from the nozzle
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